Based on the 13th century legend of Thomas Rymer of Erceldoun who was said to have visited the land of Faery and returned with the gift of prophecy and tongue that could not lie.
Many of Thomas of Ercildoune's (True Thomas's) predictions are in circulation, though only a few are precisely dated or can be tied to specific events.
Perhaps the most famous prophecy dates from 1286, the year Alexander III of Scotland died. The day before Alexander's death, he had forecast that "before the next day at noon, such a tempest shall blow as Scotland has not felt for many years." When the next day proved clear, Thomas was taunted, but his forecast proved true - Scotland would not again see peace until after the battle of Bannockburn in 1314.